The aircraft sits for anything up to 5 days (and possibly 7 days) on a stand that could be used frequently by other operators.
So, Kev, why would an airport disadvantage all other operators at an airport where gates are at a premium, when other parking areas are available for an aircraft that is not in use for long periods of time?
Any 'customer' has a right to inquire about questionable practices that disadvantage them, have they not?